Which statement about AV block 1st degree is accurate?

The statement regarding AV block first degree that is accurate describes prolonged PR interval without missed beats. In first-degree AV block, there is a delay in the conduction of electrical impulses through the atrioventricular node, which manifests as a prolonged PR interval on an electrocardiogram (ECG). This prolonged interval indicates that the time taken for impulses to travel from the atria to the ventricles is longer than normal.

In first-degree AV block, every impulse generated in the atria successfully reaches the ventricles, which is why there are no missed beats. Patients typically do not experience symptoms due to the typically benign nature of this block, although it could be an indication of an underlying condition in some patients.

This clearly distinguishes first-degree AV block from more severe types of AV block, such as second-degree or third-degree blocks, where some impulses are indeed blocked from reaching the ventricles. The other options do not accurately represent the characteristics of first-degree AV block, specifically the PR interval's prolonged nature.